﻿// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#region 导入名称空间

using System;
using System.Reflection.Emit;

#endregion

namespace LightWork.DynamicProxy.Generators.Emitters.SimpleAST
{
    /// <summary>
    /// </summary>
    public class ReferencesToObjectArrayExpression : Expression
    {
        private readonly TypeReference[] args;

        public ReferencesToObjectArrayExpression(params TypeReference[] args)
        {
            this.args = args;
        }

        public override void Emit(IMemberEmitter member, ILGenerator gen)
        {
            var local = gen.DeclareLocal(typeof(object[]));

            gen.Emit(OpCodes.Ldc_I4, args.Length);
            gen.Emit(OpCodes.Newarr, typeof(object));
            gen.Emit(OpCodes.Stloc, local);

            for (var i = 0; i < args.Length; i++)
            {
                gen.Emit(OpCodes.Ldloc, local);
                gen.Emit(OpCodes.Ldc_I4, i);

                var reference = args[i];

                ArgumentsUtil.EmitLoadOwnerAndReference(reference, gen);

                if (reference.Type.IsByRef)
                    throw new NotSupportedException();

                if (reference.Type.IsValueType)
                    gen.Emit(OpCodes.Box, reference.Type.UnderlyingSystemType);
                else if (reference.Type.IsGenericParameter)
                    gen.Emit(OpCodes.Box, reference.Type);

                gen.Emit(OpCodes.Stelem_Ref);
            }

            gen.Emit(OpCodes.Ldloc, local);
        }
    }
}